Tungsten Oxide Preparing Tungsten Disulfide Lubricant
Tungsten disulfide is a kind of solid inorganic lubricant material. The appearance and physical property is similar to calcium disulfide. The physical and chemical property of tungsten disulfide shows that it can not only be used in the regular lubricant, but also can be applied under certain high temperature, low temperature, high load, high vacuum and corrosion circumstances. It can be used with powder appearance, or can be mixed with lubricant, graphite, metal powder or plastic as compound materials.
With the development of scientific technology, the requirement for lubricant material has also been promoted. To solve the lubricant problems, tungsten disulfide has draw people’s attention like other innovative materials. Although there are many methods to prepare tungsten disulfide, the thorough material about its preparing method is rare. The method using tungsten oxide to prepare high purity tungsten disulfide is easy to operate and can assure the quality of the product.
Preparing method:
Raw material: Tungsten oxide (WO3); Sulfuric acid: 20% aqueous solution; Sodium sulfate: 20% aqueous solution.
(1) Adding a certain amount of tungsten oxide into tray, then press it properly. Put the tray into the middle of tubular reactor, connect the conduit, seal the gaps between all interfaces with wax or stop-leak compound. Open the outlet valve of container of sulfuric acid and sodium sulfide, the hydrogen sulfide gas is obtained.
(2) Lead hydrogen sulfide from the bottom of container. After the outlet gas of the container is non-explosive gas (use tube to gather gas to test), clean the bottle by connecting sodium hydroxide container.
(3) Adjust flow rate of sulfuric acid and sodium sulfide solution to keep the pressure of system under 3.92~4.90kPa. Charge with electricity, upper the temperature to a certain value, and keep it stable, lower the temperature to 400℃ when input hydrogen sulfide. Then stop inputting and keep it to room temperature.
(1) Adding a certain amount of tungsten oxide into tray, then press it properly. Put the tray into the middle of tubular reactor, connect the conduit, seal the gaps between all interfaces with wax or stop-leak compound. Open the outlet valve of container of sulfuric acid and sodium sulfide, the hydrogen sulfide gas is obtained.
(2) Lead hydrogen sulfide from the bottom of container. After the outlet gas of the container is non-explosive gas (use tube to gather gas to test), clean the bottle by connecting sodium hydroxide container.
(3) Adjust flow rate of sulfuric acid and sodium sulfide solution to keep the pressure of system under 3.92~4.90kPa. Charge with electricity, upper the temperature to a certain value, and keep it stable, lower the temperature to 400℃ when input hydrogen sulfide. Then stop inputting and keep it to room temperature.
Under high temperature, tungsten oxide reacts with hydrogen sulfide, tungsten disulfide with chemical formula WS1.98一WS2.12 is obtained. This method is easy to operate and stable.
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